Screen



P 1942.v c. DREYFUS 2,294,966

SQBEEN Filed Feb. 3, 1940 Ticul.

, INVENTOR camllle Dreafus ATTORNEYS Patented Sept. 8, 1942 UNITED STATES PATENT OFFICE SCREEN Camille Dreyfus, New York, N. Y. Application February 3, 1940, Serial No. 317,152

8 Claims.' (Cl. 156-14) This invention relates to insect screens, and relates more particularly to insect screens made of transparent artificial organic materials.

Insect screens have heretofore been made of wire cloth, i. e. a fabric of woven metallicwire, normally stretched in and ailixed to a frame and hung in windows of homes, automobiles, trailers or wherever it is desired to prevent the entrance.

structure upon which it had been hung. Wire cloth screens require frequent painting to give them a neat appearance.

It is an important object of my invention to provide an insect screen which will be free from the above-mentioned and other disadvantages and which will be emcient in operation and inexpensive in cost.

Another object of my invention is the provision of a novel insect screen made of sheets of artificial organic materials which are strong, fiexible and substantially resistant to weathermg.

A further object of my invention is to provide an insect screen made .oftransparent sheet material whereby substantially no light is lost in its passage through the screen.

Other objects and advantages of this invention will appear from scription.

' In accordance with my invention I make an insect screen from transparent artificial organic sheet material by forming in said sheet material openings of any geometric shape but small enough to prevent insects from passing therethrough. The portions of the sheet material between the openings should be as narrow as possible to provide for the transmission of the maximum amount of air for ventilation. However, they should not be so narrow as to unduly decrease the strength of the sheet material. (The perforate sheet material is fixed by any suitable means in a frame of a size to fit the window or opening which is to be protected, in the same manner as wire cloth screening is ailixed to a frame. In the case of the sheet material of my the following detailed deinvention, however, a suitable adhesive may be employed in place of nails for attaching the sheet material to the frame. If desired, the periphery of the perforate sheet material may be reinforced by applying thereto strips of cloth or of any artificial material, or a hem maybe formed. at the edges by turning a portion of the sheet material upon itself. and pasting the same in position. T

The sheet material employed in accordance with this invention preferably has a basis of cellulose acetate. However, other film-forming substances may be employed, among which mention may be made, of other organic esters of cellulose such as cellulose propionate and cellulose butyrate, ethers of cellulose such as ethyl and benzyl cellulose, esters of cellulose containing inorganic radicals such as nitro-cellulose and cellulose nitro-acetate, thiocarbamic and alkoxy alkacyl esters of cellulose, condensation products of cellulose with glycols or other polyhydric alcohols and substance having a non-cellulosic base such as polymerized vinyl acetate and other vinyl compounds, other compounds such as methyl methacrylate and urea formaldehyde resins, and synthetic linear polyamide condensation products such as the polyamides derived from aminoacids or from the condensation products of diamines with carboxylic acids, e. g. polyhexamethylene adipamide.

The sheet material employed in accordance with my invention may have a plasticizer or plasticizers incorporated therein, particularly where .the insect screen is to be mounted on a roller for movement up and down relative to the window frame. The addition of plasticizer to the sheet material makes the same stronger and more flexible. Any suitable plasticizer may be used in such sheet material among which may be mentioned ethyl toluene sulphonamide, di-' butyl tartrate, dibenzyl tartrate, diethyl phthalate, dibutyl phthalate, triacetin, triphenyl phosphate and tricresyl phosphate.

If colored screens are desired for any purpose dyestufis may be incorporated in the sheet ma-- 2 .2,294,aee

where desired may be flowed into a shallow mold containing pins spaced as required, which pins have a cross-sectional configuration of the opening desired in the finished product. The sheet material or screen may be of any suitable thickness. I have found however that sheet material having a thickness of from 0.003 to 0.005 of an inch is very satisfactory for the purpose of forming window screens. Thicker films or sheets may, of course, be employed where desired.

In the accompanying drawing wherein insect screens in accordance with my invention are shown: 4

Figure 1 represents an insect screen in which the perforate sheet material is mounted in a frame,

Figure 2 represents a section of the screen material shown in Figure 1 but on an enlarged scale, and

Figures 3 and 4 represent portions of sheet material having openings of a configuration different from that shown in Figures 1 and 2.

Like reference numerals indicate like parts throughout the several views of the drawing.

Referring more specifically to the drawing there is shown a frame 5 in which is stretched and fixed a transparent artificial organic sheet material 0 having perforations I therein of such a size as to prevent the entrance of any insects therethrough. The portions 0 of the sheet material between the perforations should be as narrow as possible but not so narrow as to unduly weaken said sheet material. The sheet material 0 may be provided with a reinforcing strip or hem I about its periphery thereof in order that the same may not be torn when placed in the rame.

rial, said sheet having openings therein of sufficiently small size as to prevent the passage of insects therethrough and in sufflciently large number to permit free circulation of air.

2. An insect screen comprising a transparent sheet having a basis of cellulose acetate, said sheet having openings therein of sufliciently small size as to prevent the passage of insects 'therethrough and in sufliciently large number to permit free circulation of air.

3. An insect screen comprising a transparent sheet having a basis of a synthetic resin, said sheet having openings therein of sui'ficiently small size as to prevent the passage of insects therethrough and in sumciently large number to permit free circulation of air.

4. An insect screen comprising a transparent sheet having a basis of cellulose acetate and containing a plasticizer for said cellulose acetate, said sheet having openings therein of sufilciently small size as to prevent the passage of insects therethrough and in suiilciently large num permit free circulationof air.

5. An insect screen comprising a trans ent perforate sheet'having perforations of such s all size asto prevent the passage of insects therethrough but in sufllciently large number to permit free circulation of air having a basis of an.

- from 0.003 to 0.005 of an inch.

Figure 3 shows the sheet material 6 having I square openings or perforations ll therein and Figure 4 shows the sheet material perforated by triangular shaped openings 12.

The insect screen made in accordance with my 7. An insect screen comprising a transparent perforate sheet having perforations of such small size as to prevent the passage of insects therethrough but in sufflciently large number to permit free circulation of air having a basis of a synthetic resin, said sheet having a thickness of from 0.003 to 0.005 of'an inch.

8. An insect screen comprising a transparent perforate sheet having perforations of such small size as to prevent the passage of insects therethrough but in sumciently large number to permit free circulation of air having a basis of cellulose-acetate and containing a plasticizer for said cellulose acetate, said sheet having a thickness of from 0.003 to 0.005 of an inch.

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